Here's what I found in Grayson Co. arrest records for Shilling. He was arrested on the same date that Blake was found.
https://judicialsearch.co.grayson.tx.us:8443/JailingDetail.aspx?JailingID=274091
2017-0063
SHILLING, KEVIN LYNNE LAVINE
Booked 01/06/2017 Released 01/06/2017
Grayson County Sheriff's Office
BURGLARY OF BUILDING
THEFT OF FIREARM
2017-5396
SHILLING, KEVIN LYNNE LAVINE
Booked 12/18/2017 Released 02/13/2018
COUNT 1 -MTA-THEFT OF FIREARM
COUNT 2 -MTA- BURGLARY OF BUILDING
2018-3918
SHILLING, KEVIN LYNNE LAVINE
Booked 09/13/2018 Released 11/30/2018
MTA/COUNT 1 THEFT OF FIREARM
MTA/COUNT 2 BURGLARY OF BUILDING
2020-3263
SHILLING, KEVIN LYNNE LAVINE
Booked 12/24/2020
TEXAS RANGER
CAPITAL MURDER BY TERROR THREAT/OTHER FELONY
TAMP/FAB PHYS EVID W/INTENT TO IMPAIR HUM CORPSE $850,000 surety bond
UNAUTH USE OF VEHICLE $150,000 surety bond
Sherman Police Department
BONHAM PD/EXPIRED REGISTRATION
BONHAM PD/FAILURE TO APPEAR
BONHAM PD/FAILURE TO APPEAR
BONHAM PD/FAILURE TO APPEAR
BONHAM PD/NO DRIVER'S LICENSE (WHEN UNLICENSED)
BONHAM PD/NO LIABILITY INSURA